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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c535eacc485c6c2101f453d4183140454f1d8c9d0a4bf285e9721831d83741' 
  AND token = '5qfAQWU17OWwGTn+ci+eq4M6OF55fRSqR7lwjDOsmSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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