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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad61ae1d76ea9f33f8f50bca71b796abd3374a7c3c48f9a1cfda4b3a1808ebc1' 
  AND token = '4mqD48HjpIbbeFBmjOhFHHHib4+MX3C+zLeDeLsWW4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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