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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf8c7e0cfc3d8d00dbaf6379b6c287d6623f366e874d66b7c13eb7829ee6303' 
  AND token = 'NV/AuHpYEapF0wUYb1gMmrQKdyqEVtkFZCrlpDDv534=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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