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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7bf1e634038b4a9b1c4c5c431fe70057091339e06ba3e1ae8f7edfc281572b' 
  AND token = 'HJ1s33JRW+iYUnj29Nv5DwdG2xhbuqU3auJLLsJkqvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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