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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9e5b2fa4345635e96d42c9a2f3a195473a6ba30644c5eee17bf71fa28ee3cf' 
  AND token = 'h4xQ4J2IazHEla8Q+SoQUKqegDBhsQspFTYwHfQR23I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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