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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bada1e2e34325e82cf80160440d1783731f371dab8d1185f0a6a77cc5b8d65' 
  AND token = 'IBlcWJH3JqglAH9t4GsM/J2PSaD2Z1LM+p8g6PsfoC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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