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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709b58b2a0615eb9a515e031934835987500d15d115439201fec73785e8b3143' 
  AND token = 'LBmM9QwF5TqBSGBNzVLoSaTfKzQ7pd0yJZLVaNp+1N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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