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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c446e3aaa973666b1990964be4f20f3b1c264592ee1aaecdb483eb5c850ecb' 
  AND token = 'g6y64e70USB9j4WIZY23UwT2dbERzGk9dlAND4FYL9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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