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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b87719242b4646c4eb99da8060c4df440cf7dedb0377f6c8fb2dd49fad00df9' 
  AND token = 'FA/Na4j1ZWe6vfn28JpbX2RbiSRJh8ito0G6i7z+0JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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