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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6b02bd1a044d1dc9021c99e53496dc7cccff0109a314290f81ab4fb3063924' 
  AND token = '8dX8oF2lMl4yRonAwimczSTcsry6b8x3NykGxRhmLRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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