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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e84e6c3eab3670e20a1b5264b0d033adc25ac390dd4f787bdbb00d0fa956ec1' 
  AND token = 'ZwvEHgmmfYu4Nxn806DzjpJ03+YIMwe3KC+o9DIt8lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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