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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc7a7e38623dbe61c4c01be0c6a4b167f74f549eea8f0e00b4271f1c2e148a5' 
  AND token = 'kq9c6GZm8lWjCxzd12toKMq3T9rjQILfJ5XTjEdn5F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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