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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cf70b36ef271689cf99f8bdf8a2bf1ce5f8d3443acc9c2115dffde480c0a94' 
  AND token = '+8V7yzaTk9bWw5XkRZF3C/VPL9hoipA++EQZ3kFvvo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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