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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b69561a4940b349de219487f26d1c326baff1171bb478a20fb525174a43bcc7' 
  AND token = 'P7mETJKHXXEQtYso8ceVv81iVlSKJzthsckWI1eKTrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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