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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd74e9d13cc59a75f75be33aeee440f8f5961aad86d3bc81cb92820a1478e16' 
  AND token = '2BArt6Xpw53XDW5PIkKWmYUasMxO9EvX7X8I6/5izGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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