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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76c1334f1443fba575117f8a36035b9c855fe4f57fdc5b65b0278d568d0c45f' 
  AND token = '6MmpzTkSiGZ57cajTxIY1Eph7e3Ch5erkWIESNTO3PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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