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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fdef9766475dac67f67f6a2d1740e0515f3cb5d8bdae9213450d1320799344' 
  AND token = 'GbnhDPReZZznTb3YpJeCQH7ssmWB2ks9VMeryhnz1f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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