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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74f6a46f2e659c722d78b60e91c4411641bf40be8a81d209e95b8e925dd0b47' 
  AND token = 'THL8xFfLCdNF7ah/joNr+2fNcGj5gtrHKvJRFBq3fn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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