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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3d6f9f9430f7d1c36e6215628ec7c43c7da1783811b28172f5230bbc1b7310' 
  AND token = '+JOFlZkMGHUwHc8tRWuEo7NpUj1Ug13DdnY+m21b5L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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