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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0596e4b57014239ce4a6b56246f196d6f825bbe65ee98bc50b68ba1deeb4db' 
  AND token = 'hlx4YfDft3g01wxR7q139QeqTu/JK/EF+nez7ng+XnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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