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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c8866b0c95381ae8f2b7c520c3e707e82c65c24892ddba6adb0501177415b0' 
  AND token = 'dz3wU4cMcQPN8lcoGjvyAex6Bej8ZCOLdTXwbzVBLQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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