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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558cdae87665597163092caf649d88b11db7a3fbca5e05b77d90c2a9084d2c3a' 
  AND token = 'dh3TaUL3pGHi2C+InQOI0CU1VD9KB8u9aQB7ypGlqic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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