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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fd0e7f591c13ef5097bec1ad6f5dbaba00904f526a38d436c02ee615182b3d' 
  AND token = 'kJT0tZ8KX6vWawV2FxMbWI7mVKINC4nzdhda72hIvAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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