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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87a12318a780fe9ef84bc5e7b0a52aec4abd69e9bf42e8e27d5ab7988c0f8d8' 
  AND token = 'eORb0vY4oy44Okxtt8g2Fq6N8QS8f9vOwBTLQ8Jfzt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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