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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f40c3b55b0d32a1bd94f8c8143cf2abcf3fe1fc31a5358875e3de5c545afdc' 
  AND token = '2nl8i8tSokoebITT0S7882AEuKtfowrLJOKfOpNPdcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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