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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a530631ca1f2c963b618fcaeb964a1f9c84875236b3921cb7043181847ff577' 
  AND token = 'vN64zB87IgwSDJED7wADGW384mUOlyXr3bV4KEbpudI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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