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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4e72f64be68ecc109318911b292139c51f745a9afd6008012d3c13ed8fc8f8' 
  AND token = 'jbU3g0mkOWRihCGOSEDUWe5MvoE8H/J5RH0Jt9CncKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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