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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223725f3ccec642d32c334354203cb98338f9e19940ba19a4f4cbde58298c818' 
  AND token = 'sYrnDskiw34kXWAK69R+m/LkkPEHlesBpN0QC/PcOHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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