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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48f4f84401d6bffe21de10b30c911683970fee3fbf9b13bab3dfd570b5aac73' 
  AND token = 'APMWldx/WrTT01XO0pQLdRXN69S8/2rENBzrOcoZLrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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