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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddecc81cadd71b9801a1e73fbeb3f7b74b2f3684acacc2eb277fc0caa3787aee' 
  AND token = '2whmj/fPl8Qg2Jvoe2b4DGkWeGF4J+ZwwBTJmEfvU8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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