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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ecaf173fb39b5558e7d279b0a8ffe784548edee403d54956b0c87f52de1485' 
  AND token = 'mm1trAVkFSYQbaJF5WiQVnR+VdgjqVDZ8+opBrVqiIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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