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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3977c7c148347d34361c6bb8aedd9907b267aeb9bc1ee779acd5f983d37f7eb7' 
  AND token = 'dpgMloSUgosKrxS/3Rruxur9masc44emzJn0J793dXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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