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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1ab0f176ec3bf46b5682a85d862d63000647e48d68df014292d4f08157dcec' 
  AND token = 'y5N5mGFIDR/1WSU9pF6Ru+cM2AoAufPMZBBWF3pO1dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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