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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03550a56a4dd9da7c12e053179d603ef472667c33f44ed18d046aff47a2fd812' 
  AND token = 'xkk2sXF8O1qvriL11FhPVp5uvycmljMvNQh2zEAOVxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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