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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f4293aff5dd637e2243b427624ce76eaa1ca60fad862dadf8dcb4657992adc' 
  AND token = 'tfqO2gEh7WIZf7W2yMdwlCvDGFROPY+GjWhRK5FaxMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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