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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9acdc18174239acb6fad47d30177ec779870abd1293b32a3cb5c7bc118ea940' 
  AND token = 'bI5ya/HG4exSmg5AkY4gY1V6ZZLtxcwRG6bOVsP8mes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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