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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa24b743aa94a0de2de7438e79ffefa5e3eb01bb4d18699ec8708e25256937b4' 
  AND token = 'kZrIMuUqXbwn2mqTgksW49Ax2UlLtzdJdzGLwx3JUzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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