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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baad351666e69d220f9083b4390b4c49132351e65ab5cb9056a33a86974e247c' 
  AND token = 'fkCc4jrGuRLS7VY3JT94wFhGnyawao1RWJByntaDVjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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