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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce5327cdf6883ad41b4158e4e38012cc21ec3a5bd66ecffbf7f385f93e2591b' 
  AND token = 'AMrKOcLxL+SaIZENMJwFLRC072+C0r/NvWREWlWz8WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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