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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3801c2653110c85d3ab88eef60ae9f42dba1add6ab1bbb4d76ea49d97093d0' 
  AND token = '6/vZSL42HhW/5VTlvVHtMtk9L3wpM0+Kh3CnKNy+bwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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