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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde91c83f9fc72de8032643c911ba6c12498aef53e70def52cb8ceac86709adb' 
  AND token = 'DyByNg5s6Q1IluBqyQ401DmRdcaXJgYKjPyk641OVLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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