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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bb1127da28a78b8176de7d8580d0610679f2322731413398184e1af8580461' 
  AND token = '5JVQp4kdZQ8tWMA4AdXMXK0V53nnMl9VJxu+b7QpWFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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