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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ebfcdd04d96661a303e8be4b8aabaa025dfdd2a5372ec3a95fdcdf4ee09b97' 
  AND token = 'rQYKmbJ6cOVvEibw/hkOKvYSIYyNE0wxRFzFLPdxSl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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