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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a73dbf2948533bdb8ab938b7a638b3cb6c3d64748fe3cc95efbbbaa6cc5bfc' 
  AND token = 'xgH1hG3EKjg6f11FTcpua1ckI3mVIe1l+aBGzD1Zsi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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