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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77465db2ddb9030fc7a784fe8eb3a24fd86e605f6d2edb93e03b3dfc51cbc153' 
  AND token = 'SUoeZ6ENOUK90PB3Bxw3yqVs+upr0ayTvbIPEXwexWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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