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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca2543bd94fed806f0e5e5ea4373409afce3d0ee1133bb4e45b1cbb2ada971d' 
  AND token = 'G0PZ5kAzGmk6HJT2WdMrTy5jNATPWhcMbFmpFswOh0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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