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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db93ca9a0a4d0cd069217cf16b0b2b84318486e35e61e3a4f4544113ed502aa3' 
  AND token = 'Sw42JSkoQdzQ8Gan2oejuyrbhimtbmvBR+qZweLcBYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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