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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7656083f667207c29584544fc450e16dfb1036b1c02759dd9802ed611dcad413' 
  AND token = '75NVjZ/rffinBM/vwXbEy1KKiXgjEnmbf3x60yg8W/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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