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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e397c6b047f41c9010d659576894492b108c19ab6ea7c4fcffe134cc7d3b8a' 
  AND token = '/E+pW/eG76bW0HjJCchtMc9iuahwRv+QNqohilE9dvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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