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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70f17ae4820ac2dc4959a350cee0aa48c7b4fb32543df78d262c23c63ee453a' 
  AND token = 'nC5kfdsN5AqdwklcNfYtWi335L7Pi4+pzS/B7MdESVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}