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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c579ecaa93c7ee44d7f51717030f416234e33619cf2c95a779cf6ea748bab4' 
  AND token = 'gBi+aXPga8LIIuO3OG43slIh7h23kNR+wnVmdHy9320=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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