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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc63f01b72632e37d3c5a83a1c3879b03a611e3a4b965b54b9b7663a800a5c78' 
  AND token = '+F6PcIrRqLJYzrdLN0o34EZDnm4o5tNty7Q0pt5t278=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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