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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a6662dba3fb63d7b4eb97d1b9c8a44ac1e8d7b44d2971cdf391206ffc75009' 
  AND token = 'D873tIfcsPG/OFZ3WXlPMfuuuYRpekl1L9bp3D4TNNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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