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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43bd48a72aac437f582cad20a13176bd4dc8ccfa2f42a8d15baa942e60e5928c' 
  AND token = 'hsXaOi+QKVkhG6uS1erOHSwg0SyzDRT3Frr6xZfggJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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