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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c98021812be6f5918156e6767c2507a1d82324f902395eb0850b31ad0b90f5d' 
  AND token = '//RgoOcbt7lHGLgIl2jt0+FaiJJ2t0dWck+nOSy5H0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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