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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a699c00e05c8f008094823a4bdcbe3104732de5be521b3b5394b430b39fa6b5' 
  AND token = 'C2LCVUjYmFFKqVM6f9pVTffPP9MgjdOn19S5I1s1JMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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