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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1882f70aea4ca8e6d8f855a5b3f1835b23cc2e5514341e319eaf6a264e6914' 
  AND token = 'S9fcaFpT67PFdN4jHm04b2PlUrgz4r5avFv52wvl8O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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