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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0d7f84d3260be72acf7a46a2747363c0b263f28b73e3a4100d99ac085e5a5c' 
  AND token = 'l+eHpJkQCfK+qtbx2Pqem4+3IKrzeSOsduGgy3JatYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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